Vesicula seminalis see seminal vesicle

vesparium n. [L. vespa, wasp; -arium, place for] (ARTHRO: Insecta) In Hymenoptera, a natural or artificial colonial nest of vespine wasps.

vespid venom gland (ARTHRO: Insecta) In Hymenoptera, a type of venom gland in which two tubes end in a distinct spherically formed reservoir whose wall has a strong muscular layer, but no glandular elements.

vessel n. [L. dim. vas, vase] A tubular structure that conveys fluid.

vestibular organs (CHAETO) A transverse row of papillae, or papillae on a ridge, just behind the teeth.

vestibular pit (CHAETO) A glandular depression behind the vestibular organs.

vestibular wall (BRYO) The body wall surrounding the vestibule and connecting the tentacle sheath to the wall of the orifice.

vestibule, vestibulum n.; pl. -bula [L. vestibulum, entrance hall] 1. A cavity forming an entryway to another cavity or passageway. 2. (ANN) Containing a penis or male poro-phore and pore fissure. 3. (ARTHRO: Crustacea) In Ostra-coda, a space between the duplicature and outer lamella.

4. (BRYO) The area through which the lophophore passes.

5. (ROTlF;CHAETO) An opening leading to the mouth. 6. (nemata) see stoma, cheilostome. vestibulate a.

vestige n. [L. vestigium, footprint] A degenerate or imperfect remaining ancestral organ.

vestigial a. [L. vestigium, footprint] Pertaining to a small, degenerate, nonfunctional organ that was ancestrally more fully developed or functional.

vestiture n. [L. vestis, garment] The body covering, as scales or hairs.

vexillum n.; -illa [L. vexillum, flag] (ARTHRO: Insecta) In fos-sorial Hymenoptera, an expansion on the tip of the tarsi.

viable a. [L. vita, life] Capable of living; the ability to grow and develop.

vibraculum n.; pl. vibracula [L. dim. vibrare, to vibrate] (BRYO: Gymnolaemata) A heterozooid with the operculum in the form of a long bristle or seta between pivots, supposedly used to sweep away detritus and settling larvae.

vibrissa n.; pl. -sae [L. vibrissa, whisker] 1. Stiff hairs or bris tles. 2. (ARTHRO: Insecta) For Diptera, see oral vibrissae.

vibrissal ridge (ARTHRO: Insecta) In Diptera, a ridge arising on each side of the face, inside the arms of the frontal suture; limited distally by the epistoma and the vibrissal angles; facial ridge.

vibrotaxis n. [L. vibrare, to vibrate; Gr. taxis, arrangement] An organism's response to mechanical vibrations.

vicarious a. [L. vicarius, deputy] 1. Taking the place of. 2. Closely related taxa in corresponding but separate environments.

vicarious polymorph (BRYO: Gymnolaemata) A polymorph in a budding series that communicates with several zooids.

vicinal a. [L. vicinus, neighbor] Neighboring; nearby.

vicinism n. [L. vicinus, neighbor] The propensity to variation due to proximity of related organisms.

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